The Supercooled Liquid of the Bulk Metallic Glass Forming Zr46.25Ti8.25Cu7.5Ni10Be27.5 Alloy on Long Time Scales

1998 ◽  
Vol 269-272 ◽  
pp. 577-582 ◽  
Author(s):  
Ralf Busch ◽  
William L. Johnson
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Time Scales ◽  
Supercooled Liquid ◽  
Glass Forming ◽  
Long Time

Strong Liquid Behavior of Zr-Ti-Cu-Ni-Be Bulk Metallic Glass Forming Alloys

1996 ◽  
Vol 455 ◽  
Author(s):  
Ralf Busch ◽  
Andreas Masuhr ◽  
Eric Bakke ◽  
William L. Johnson
Keyword(s):  
Glass Transition ◽  
Melting Point ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Supercooled Liquid ◽  
Glass Transition Region ◽  
Glass Forming ◽  
Liquid Behavior ◽  
Metallic Liquids ◽  
Microscopic Origin

ABSTRACTThe viscosities of the Zr46.75Ti8.25Cu7.5Ni10Be27.5 and the Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass forming liquids was determined from the melting point down to the glass transition in the entire temperature range of the supercooled liquid. The temperature dependence of the viscosity in the supercooled liquid obeys the Vogel-Fulcher-Tammann (VFT) relation. The fragility index D is about 20 for both alloys and the ratio between glass transition temperature and VFT temperature is found to be 1.5. A comparison with other glass forming systems shows that these bulk metallic glass formers are strong liquids comparable to sodium silicate glass. Furthermore, they are the strongest among metallic glass forming liquids. This behavior is a main contributing factor to the glass forming ability since it implicates a higher viscosity from the melting point down to the glass transition compared to other metallic liquids. Thus, the kinetics in the supercooled liquid is sluggish and yields a low critical cooling rate for glass formation. The relaxation behavior in the glass transition region of the alloys is consistent with their strong glassy nature as reflected by a stretching exponent that is close to 0.8. The microscopic origin of the strong liquid behavior of bulk metallic glass formers is discussed.

scholarly journals Vitrification and determination of the crystallization time scales of the bulk-metallic-glass-forming liquid Zr58.5Nb2.8Cu15.6Ni12.8Al10.3

2001 ◽  
Vol 79 (11) ◽  
pp. 1605-1607 ◽  
Author(s):  
C. C. Hays ◽  
J. Schroers ◽  
W. L. Johnson ◽  
T. J. Rathz ◽  
R. W. Hyers ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Time Scales ◽  
Crystallization Time ◽  
Glass Forming

Effects of Minor Si Addition on Glass Formation and Thermal Stability of Ni Free Ti-Based Bulk Metallic Glass

2013 ◽  
Vol 750 ◽  
pp. 36-39 ◽  
Author(s):  
Sheng Li Zhu ◽  
Guo Qiang Xie ◽  
Feng Xiang Qin ◽  
Xin Min Wang
Keyword(s):  
Thermal Stability ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glassy Alloy ◽  
Supercooled Liquid ◽  
Glass Forming Ability ◽  
Glass Forming ◽  
Si Content ◽  
Si Addition ◽  
Thermal Stability Of

The effects of small amounts of Si on the glass-forming ability, thermal stability and mechanical property of a TiZrCuPdSn bulk metallic glass were investigated. The addition of Si caused the decrease of glass-forming ability and the increase of the supercooled liquid (SCL) region. With 2 at.% Si addition, a significant SCL region of 80 K was obtained, which indicated high thermal stability of the glassy alloy and was in favor of secondary working by viscous flow deformation. With increasing Si content, the plasticity decreased.

Viscosity Measurements of Zr55Cu30Al10Ni5 Supercooled Liquid Alloy under High-Speed Heating Conditions

2007 ◽  
Vol 539-543 ◽  
pp. 2071-2076 ◽  
Author(s):  
Tohru Yamasaki ◽  
S. Maeda ◽  
Daisuke Okai ◽  
Takeshi Fukami ◽  
Yokoyama Yoshihiko ◽  
...  
Keyword(s):  
Glass Transition ◽  
Metallic Glass ◽  
Heating Rate ◽  
Bulk Metallic Glass ◽  
Liquid Alloy ◽  
High Speed ◽  
Supercooled Liquid ◽  
Glass Forming Ability ◽  
Glass Transition Temperatures ◽  
Glass Forming

Viscosity of a Zr55Cu30Al10Ni5 supercooled liquid alloy having bulk metallic glass forming ability has been measured by using a penetration viscometer with a cylindrical probe under high speed heating conditions at rates between 20°C/min and 400°C/min in the temperature range from the glass transition temperatures (Tg) up to above the crystallization temperatures (Tx). The viscosity of the alloy decreased with increasing the heating rate and tended to saturate at the heating rate of 200°C/min and above. Corresponding measurements of the differential thermal calorimetry (DSC) under the high-speed heating conditions have been also done.

scholarly journals A Centimeter-Sized Quaternary Ti-Zr-Be-Ag Bulk Metallic Glass

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
S. F. Zhao ◽  
Y. Shao ◽  
P. Gong ◽  
K. F. Yao
Keyword(s):  
Yield Strength ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glassy Alloy ◽  
Critical Diameter ◽  
Supercooled Liquid ◽  
Glass Forming Ability ◽  
Liquid Temperature ◽  
Glass Forming ◽  
Glassy Alloys

A novel centimeter-sized Ti-based bulk metallic glass (BMG) was developed by the addition of Ag in the ternary Ti41Zr25Be34glassy alloy. By replacing Be with Ag, the glass forming ability (GFA), the yield strength, and the supercooled liquid temperature of the quaternaryTi41Zr25Be34−xAgx(x=2, 4, 6, 8 at.%) glassy alloys have been obviously enhanced. Among the developed Ti-Zr-Be-Ag alloy systems, the Ti41Zr25Be28Ag6alloy possesses the largest critical diameter (Dmax) of 10 mm, while the yield strength is also enhanced to 1961 MPa, which is much larger than that of Ti41Zr25Be34(1755 MPa) alloy. The experimental results show that Ag is an effective element for improving the GFA and the yield strength of Ti-Zr-Be glassy alloy.

scholarly journals Effects of Annealing on Enthalpy Recovery and Nanomechanical Behaviors of a La-Based Bulk Metallic Glass

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 579
Author(s):  
Ting Shi ◽  
Lanping Huang ◽  
Song Li
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Structural Relaxation ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Liquid Region ◽  
Nanoindentation Measurement

Structural relaxation and nanomechanical behaviors of La65Al14Ni5Co5Cu9.2Ag1.8 bulk metallic glass (BMG) with a low glass transition temperature during annealing have been investigated by calorimetry and nanoindentation measurement. The enthalpy release of this metallic glass is deduced by annealing near glass transition. When annealed below glass transition temperature for 5 min, the recovered enthalpy increases with annealing temperature and reaches the maximum value at 403 K. After annealed in supercooled liquid region, the recovered enthalpy obviously decreases. For a given annealing at 393 K, the relaxation behaviors of La-based BMG can be well described by the Kohlrausch-Williams-Watts (KWW) function. The hardness, Young’s modulus, and serrated flow are sensitive to structural relaxation of this metallic glass, which can be well explained by the theory of solid-like region and liquid-like region. The decrease of ductility and the enhancement of homogeneity can be ascribed to the transformation from liquid-like region into solid-like region and the reduction of the shear transition zone (STZ).

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